RE: perception and measurement [was: G7 press calibration, best press conditions or average?]
RE: perception and measurement [was: G7 press calibration, best press conditions or average?]
- Subject: RE: perception and measurement [was: G7 press calibration, best press conditions or average?]
- From: Roger Breton <email@hidden>
- Date: Fri, 07 Nov 2008 07:03:03 -0500
Hi Klaus,
> Yes, but even then our senses are right, but maybe the quantities and
> models to quantify the sensations are wrong or inappropriate.
At that CIE Expert Symposium, in Ottawa, Canada, a few years ago, where you
and I met in person, I remember running in Mark Fairchild, in the corridors,
and asking him the million dollar fragen "does the Standard Observer
actually works", is that the source of our (matching) problems? To which I
remember he replied: the Observer does arbeit, he said, *on average*. So,
our eyes are what they are and there is no absolute guarantee that, if two
colors are a match for our instruments, that it will also be a match for our
eyes. But, on average, he insisted, they would. I've always meant to test
how far my own color matching functions are from the Standard Observer... At
one of the local universities, here, in Montreal, there is a professor at a
school of ophthalmology / optometry that uses, in his office, an apparatus
designed to characterize a person's color matching functions for vision
research. There is a head rest and then there is a monochromator that shines
all spectrum colors in one half of a bipartite field, and the observer has
to match the spectrum colors being presented using three chosen primaries.
After completing the procedure, it's possible to tell how far the person is
from some given set of color matching functions. Have you seen such a
machine in Deutchland?
This being said, I hear talk that the CIE would abandon the Standard
Observer in favor of some flavors of Cone Fundamentals? Is that true? I'm
sure I read this somewhere not too long ago and it stroke me as an important
development in color science...
MfG / Roger
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